---
product_id: 233004159
title: "BUILDMART - 48\" Plenum Box for [48\" Linear Slot Diffuser - (2 Slot) Double Slot] Premium Insulated Galvanized Sheet Metal Plenum Box for Heating and Cooling - Texas Buildmart"
price: "£307.84"
currency: GBP
in_stock: true
url: https://www.desertcart.co.uk/products/233004159-buildmart-48-plenum-box-for-48-linear-slot-diffuser-2
store_origin: GB
region: United Kingdom
---

# Dual 8" oval flex entries 48" precise dimensions Galvanized insulated sheet metal BUILDMART - 48" Plenum Box for [48" Linear Slot Diffuser - (2 Slot) Double Slot] Premium Insulated Galvanized Sheet Metal Plenum Box for Heating and Cooling - Texas Buildmart

**Price:** £307.84
**Availability:** ✅ In Stock

## Summary

> 💨 Elevate your HVAC game with sleek, insulated precision!

## Quick Answers

- **What is this?** BUILDMART - 48" Plenum Box for [48" Linear Slot Diffuser - (2 Slot) Double Slot] Premium Insulated Galvanized Sheet Metal Plenum Box for Heating and Cooling - Texas Buildmart
- **How much does it cost?** £307.84 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/233004159-buildmart-48-plenum-box-for-48-linear-slot-diffuser-2)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Customizable Aesthetic:** Compatible with over 70 vent cover sizes and paintable finishes to match any modern interior.
- • **Effortless Installation:** Screw-in mounting with hidden pre-drilled holes keeps aesthetics flawless and setup hassle-free.
- • **Precision Engineered Fit:** Exact 48" length with dual 8" oval entries ensures seamless airflow integration.
- • **Optimized Airflow Balance:** Recommended 'Y' splitter use guarantees even air distribution through your diffuser.
- • **Premium Insulated Durability:** Galvanized sheet metal with foam insulation for superior thermal efficiency and longevity.

## Overview

The BUILDMART 48" Plenum Box is a premium insulated galvanized sheet metal solution designed for Texas Buildmart's 48" 2-slot linear slot diffusers. Featuring dual 8" oval flex entries and a compact 49 x 5 x 12 inch footprint, it offers easy screw-in installation with hidden mounting for a clean look. Its foam insulation enhances thermal performance, while compatibility with numerous vent covers and paint options ensures a modern, customizable finish. Ideal for professionals seeking efficient, stylish airflow management.

## Description

BUILDMART - 48" Plenum Box for [48" Linear Slot Diffuser - (2 Slot) Double Slot] Premium Insulated Galvanized Sheet Metal Plenum Box for Heating and Cooling - Texas Buildmart - desertcart.com

## Features

- Ideal for Texas Buildmart 48" 2 Slot Lineal Slot Diffuser
- Galvanized sheet metal Plenum Box with foam insulation.
- Total Box Dimensions: L: 48 3/4" W: 4 3/4" H: 11 7/8"
- Entry size: 2 entries of 8" flex in oval shape
- We recommend using a "Y" shaped splitter to supply your plenum box with an even amount of airflow through your diffuser
- We have over 70 standard vent cover sizes to replace your traditional looking grills. We also have over 40 linear slot diffuser sizes with their matching plenum box. All models are in stock ready to ship in both white and black colors – Our models are also paintable.
- All vent cover sizes can be used as both supply and return grilles. Currently our decorative air vent covers are non-filtered models. This will work perfectly if you have your filter in the machine.
- A standard linear slot diffuser is a modern looking decorative air vent cover that fits on a traditional air exit and replaces the traditional looking grills. They have a beautiful linear slot diffuser; they are easy to replace since it is retrofit to the traditional vent cover sizes. Enjoy the incredible looks, the durability since it is 100% aluminum, and they are also very easy to clean. A linear slot diffuser is a linear air exit or vent cover with a long linear look
- The size that you need to know to buy this vent cover, or any other vent cover is by measuring the air duct opening (the plenum box opening) and not the face size or the vent cover. We recommend you remove the old air vent cover and measure the size of the air duct opening. You do not need to take into consideration the face size of the vent cover. The important measurement is the interior duct opening size. Example: A traditional vent cover can have a face size of 14x8 & neck of less than 12x6
- The method of installation of our modern air ac vent cover is hidden through the pre-drilled holes inside of the diffuser, which can be accessed by opening the dampers and using a drill with a six-inch extension to screw it into place. Please find attached our instructional videos. This way we avoid having a front drill screw and ruin the esthetics of the product.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08946N46C |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #605,241 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2,870 in Registers, Grilles & Vents |
| Color | Silver |
| Customer Reviews | 5.0 5.0 out of 5 stars (9) |
| Date First Available | April 17, 2022 |
| Finish | Finished |
| Head Style | Philips |
| Installation Method | Screw-In |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 13.72 pounds |
| Item model number | 48x2SxPL |
| Manufacturer | Texas Buildmart |
| Material | Aluminum |
| Measurement System | English/Standard |
| Mounting Type | Screw-In |
| Number Of Pieces | 1 |
| Part Number | 48x2SxPL |
| Product Dimensions | 49 x 5 x 12 inches |
| Special Features | Easy to Install |
| Style | Compact |

## Images

![BUILDMART - 48" Plenum Box for [48" Linear Slot Diffuser - (2 Slot) Double Slot] Premium Insulated Galvanized Sheet Metal Plenum Box for Heating and Cooling - Texas Buildmart - Image 1](https://m.media-amazon.com/images/I/51gKKfqIztL.jpg)
![BUILDMART - 48" Plenum Box for [48" Linear Slot Diffuser - (2 Slot) Double Slot] Premium Insulated Galvanized Sheet Metal Plenum Box for Heating and Cooling - Texas Buildmart - Image 2](https://m.media-amazon.com/images/I/61sKllWJqCL.jpg)
![BUILDMART - 48" Plenum Box for [48" Linear Slot Diffuser - (2 Slot) Double Slot] Premium Insulated Galvanized Sheet Metal Plenum Box for Heating and Cooling - Texas Buildmart - Image 3](https://m.media-amazon.com/images/I/71FPkhmwJ-L.jpg)
![BUILDMART - 48" Plenum Box for [48" Linear Slot Diffuser - (2 Slot) Double Slot] Premium Insulated Galvanized Sheet Metal Plenum Box for Heating and Cooling - Texas Buildmart - Image 4](https://m.media-amazon.com/images/I/61UtD2TbGWL.jpg)
![BUILDMART - 48" Plenum Box for [48" Linear Slot Diffuser - (2 Slot) Double Slot] Premium Insulated Galvanized Sheet Metal Plenum Box for Heating and Cooling - Texas Buildmart - Image 5](https://m.media-amazon.com/images/I/51eWt7yedcL.jpg)

## Questions & Answers

**Q: What does a Linear Slot Diffuser do? What are Linear Slot Diffusers used for? What is a Slot Diffuser?**
A: Linear Slot Diffusers are Vent Covers that are Linear and the “face” of a vent. The Air Conditioning unit distributes air throughout the home/building via the air duct tubing and delivers hot/cold air to each room that the vent is in.

**Q: Are Linear Slot Diffusers good?**
A: Linear Slot Diffusers are the “face” of the vent, often referred to as a Vent Cover. Linear Slot Diffusers are good in the sense that they are aesthetically pleasing to look at and give a modern feel to any room they are in.

**Q: How do I choose a Linear Slot Diffuser?**
A: For New Builds, we always recommend checking with your HVAC Contractor to confirm the CFM’s each room will need and then selecting your Linear Slot Diffusers based on the CFM’s

**Q: What sizes do vent covers come in? What is the standard vent cover size?**
A: Vent Covers, Grilles, Registers, Diffusers come in different sizes. The most Standard Sizes being 10” x 6” and 12” x 6” and 8” x 4” - You will find at least one of these in most homes.

## Frequently Bought Together

- BUILDMART - 48" Plenum Box for [48" Linear Slot Diffuser - (2 Slot) Double Slot] Premium Insulated Galvanized Sheet Metal Plenum Box for Heating and Cooling - Texas Buildmart
- BUILDMART - 48" Linear Slot Diffuser - (2 Slot) Double Slot - White Decorative Air Vent - Modern AC Vent Cover for Ceiling, Walls & Floors - Texas Buildmart
- BUILDMART - 60" Linear Slot Diffuser - (2 Slot) Double Slot - White Decorative Air Vent - Modern AC Vent Cover for Ceiling, Walls & Floors - Texas Buildmart

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*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-06-23*